Features: 1. Size: 40*80mm/1.5 x 3.1 inch cylinder. These sponges are made from the top-quality filtration foam, BPA free and safe to your fish,no harm to water PH quality, good for freshwater and saltwater environment. 2. Help to trap particles and debris,and prolong the life of yourfilter media,provide efficient water flow with less clogging for long lastingfiltration,enhance filtration. 3. Prefilter sponge can prolongs the life of your filter media, can be used again after cleaning.Made from reticulated low density black sponge, flexible. 4. A must have accessories for fish tank filter: Premium pre-filter foam sponges can be quickly and easily attached to the fish tank intake tube stem, preventing small or weaker inhabitants from being drawn into the filter. 5. If you have any question, please feel free to contact us. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Material: sponges Size: As picture show Package List: 10 x Pre-Filter Foam Sponge Roll